Negative electrode of power storage device and power storage device

Abstract

A mixture of amorphous PAHs and at least one of a carrier ion storage metal, a Sn compound, a carrier ion storage alloy, a metal compound, Si, Sb, and SiO 2 is used as the negative electrode active material. The theoretical capacity of amorphous PAHs greatly exceeds that of a graphite-based carbon material. Thus, the use of amorphous PAHs enables the negative electrode active material to have a higher capacity than in the case of using the graphite-based carbon material. Further, addition of at least one of the carrier ion storage metal, the Sn compound, the carrier ion storage alloy, the metal compound, Si, Sb, and SiO 2 to the amorphous PAHs enables the negative electrode active material to have a higher capacity than the case of only using the amorphous PAHs.

What is claimed is: 
     
       1. A method for manufacturing an active material, comprising the steps of:
 mixing a first particle and a second particle to obtain a mixture; and 
 baking the mixture under an inert atmosphere at a temperature greater than or equal to 600° C. and less than or equal to 800° C. to form an active material particle comprising a polycyclic aromatic hydrocarbon after mixing the first particle and the second particle, 
 wherein the active material particle has a shape that the second particle is attached to an outer surface of the first particle, 
 wherein the first particle comprises one selected from the group consisting of a phenol resin, a furfuryl alcohol resin and a saccharide in the mixture, and 
 wherein the second particle comprises SiO 2  in the mixture. 
 
     
     
       2. The method for manufacturing the active material according to  claim 1 ,
 wherein the first particle comprises a phenol resin in the mixture, and 
 wherein the active material particle comprises a polyacenic material. 
 
     
     
       3. The method for manufacturing the active material according to  claim 1 , wherein the mixing of the first particle and the second particle is a dry-mixing. 
     
     
       4. A method for manufacturing an electrode, comprising the steps of:
 mixing a first particle and a second particle to obtain a mixture; 
 baking the mixture under an inert atmosphere at a temperature greater than or equal to 600° C. and less than or equal to 800° C. to form a third particle comprising a polycyclic aromatic hydrocarbon after mixing the first particle and the second particle; 
 forming slurry by mixing the third particle, a binder and a solvent after baking the mixture; and 
 applying the slurry onto a current collector to form an active material layer, 
 wherein the third particle has a shape that the second particle is attached to an outer surface of the first particle in the active material layer, 
 wherein the first particle comprises one selected from the group consisting of a phenol resin, a furfuryl alcohol resin and a saccharide, and 
 wherein the second particle comprises one selected from the group consisting of a metal selected from Si, a metal selected from Sn, Al, Zn, Sb and Bi, and a compound containing Sn, Co, Ni, Mn, Fe, V or Si. 
 
     
     
       5. The method for manufacturing the electrode according to  claim 4 , further comprising the step of:
 conducting ultrasonic cleaning of the first particle in an organic solvent before mixing the first particle and the second particle. 
 
     
     
       6. The method for manufacturing the electrode according to  claim 5 , wherein the organic solvent is acetone. 
     
     
       7. The method for manufacturing the electrode according to  claim 4 ,
 wherein the first particle comprises the phenol resin, and 
 wherein the third particle comprises a polyacenic material. 
 
     
     
       8. The method for manufacturing the electrode according to  claim 4 , wherein the third particle comprises a polyacenic material or a hard carbon-based material. 
     
     
       9. The method for manufacturing the electrode according to  claim 4 , wherein the mixing of the first particle and the second particle is a dry-mixing. 
     
     
       10. The method for manufacturing the electrode according to  claim 4 , wherein the second particle comprises SiO 2 . 
     
     
       11. The method for manufacturing the electrode according to  claim 4 , wherein the second particle comprises any one of SnO 2 , Sn 2 P 2 O 7 , SnPBO 6  and SnPO 4 Cl. 
     
     
       12. The method for manufacturing the electrode according to  claim 4 , wherein the second particle comprises a compound represented by Sn 2 M, where M is Fe, Co, Mn, V or Ti. 
     
     
       13. The method for manufacturing the electrode according to  claim 4 , wherein the second particle comprises any one of CoO, NiO, MnO 2  and FePO 4 . 
     
     
       14. The method for manufacturing the electrode according to  claim 4 , wherein the electrode is a negative electrode for a power storage device. 
     
     
       15. The method for manufacturing the electrode according to  claim 4 , wherein a grain diameter of the second particle is 10 nm to 20 nm. 
     
     
       16. A method for manufacturing an active material, comprising the steps of:
 conducting ultrasonic cleaning of a first particle in an organic solvent; 
 mixing the first particle and a second particle to obtain a mixture; 
 baking the mixture under an inert atmosphere to form an active material particle comprising a polycyclic aromatic hydrocarbon after mixing the first particle and the second particle, 
 wherein the active material particle has a shape that the second particle is attached to an outer surface of the first particle in the active material particle, 
 wherein the first particle is a spherical phenol resin particle before and after the ultrasonic cleaning, 
 wherein the second particle comprises SiO 2  in the mixture, and 
 wherein an amount of the second particle to the first particle is greater than or equal to 1 wt % and less than or equal to 50 wt %. 
 
     
     
       17. The method for manufacturing the active material according to  claim 16 ,
 wherein the first particle comprises a phenol resin in the mixture, and 
 wherein the active material particle comprises a polyacenic material. 
 
     
     
       18. The method for manufacturing the active material according to  claim 16 , wherein the mixing of the first particle and the second particle is a dry-mixing. 
     
     
       19. A method for manufacturing an electrode, comprising the steps of:
 conducting ultrasonic cleaning of a first particle in an organic solvent; 
 mixing the first particle and a second particle to obtain a mixture; 
 baking the mixture under an inert atmosphere to form a third particle comprising a polycyclic aromatic hydrocarbon after mixing the first particle and the second particle; 
 forming slurry by mixing the third particle, a binder and a solvent after baking the mixture; and 
 applying the slurry onto a current collector to form an active material layer, 
 wherein the third particle has a shape that the second particle is attached to an outer surface of the first particle in the active material layer, 
 wherein the first particle is a spherical phenol resin particle before and after the ultrasonic cleaning, 
 wherein the second particle comprises one selected from the group consisting of a metal selected from Si, a metal selected from Sn, Al, Zn, Sb and Bi, and a compound containing Sn, Co, Ni, Mn, Fe, V or Si, and 
 wherein an amount of the second particle to the first particle is greater than or equal to 1 wt % and less than or equal to 50 wt %. 
 
     
     
       20. The method for manufacturing the electrode according to  claim 19 , wherein the second particle is SiO 2  powder. 
     
     
       21. The method for manufacturing the electrode according to  claim 19 , wherein the second particle comprises any one of SnO 2 , Sn 2 P 2 O 7 , SnPBO 6  and SnPO 4 Cl. 
     
     
       22. The method for manufacturing the electrode according to  claim 19 , wherein the second particle comprises a compound represented by Sn 2 M, where M is Fe, Co, Mn, V or Ti. 
     
     
       23. The method for manufacturing the electrode according to  claim 19 , wherein the second particle comprises any one of CoO, NiO, MnO 2  and FePO 4 . 
     
     
       24. The method for manufacturing the electrode according to  claim 19 , wherein the electrode is a negative electrode for a power storage device.